19967744

素因数分解:

$2^8\times {\mathrm{77999}}^1$

素因数の和:78015

約数の個数: 18

約数和(自身を含む): 39858000

約数和(自身を除く): 19890256

約数列:

[1, 2, 4, 8, 16, 32, 64, 128, 256, 77999, 155998, 311996, 623992, 1247984, 2495968, 4991936, 9983872, 19967744]

約数ペア:

[(1, 19967744), (2, 9983872), (4, 4991936), (8, 2495968), (16, 1247984), (32, 623992), (64, 311996), (128, 155998), (256, 77999)]